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E. A. HILL. NUT LOOK.

(No Modem Na. 547,259. Patented Oct. 1, 1895.

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EDWARD A. HILL, OF CHICAGO, ILLINOIS, ASSIGNOR, BY DIRECT AND MESNEASSIGNMENTS, TO THE CHICAGO GRAIN DOOR COMPANY, OF SAME PLACE.

NUT-LOCK..

- SPECIFICA'ION forming' part of Letters atent No. 547,259, datedOctober 1, 1895.

l Application filt April 19, 1895. Serial No. 646,363. (No model.)

'io My present invention has for its object to provide a simple, cheap,and efiective means whereby nuts may be locked upon their bolts so thatall danger of the nuts working loose may be avoided, and this object Ihave aci 'complished by the features of invention hereinafter described,illustrated in the acoompahying drawings, and particularly defined inthe claim at the end of this specification.

Figure 1 is a perspective view of a bolt and v o 'nut embodying myinvention, the jaw of the nut being in position to permit the nut to beset upon the bolt. Fig. 2 is a view similar to Fig. 1, but showing thenut-jaw interlocking with the terminal of the bolt. Fig. 3 is aperspective view showing the parts in different position.

A designates the bolt, one end of which is provided with the usual heada, while the part adjacent its opposite end is formed with a ;o threadedportion a. The bolt A outside the threaded portion a' is formed with thereduced non-circular terminal 0,2, this terminal being reduoed, so thatthe nut B may pass over the same in order to engage the threads ofl thenut. In the drawings I have shown the terminal az as having four faces;but it will be readily seen that the terminal may be formed with anysuitable number of faces. In the preferred form of the invention the 40jaw b of the nut B is formed at substantially right angles to the bodyof the nut between the threaded opening and its edge, since by thismeans' the jaw is easily formed by the t dies whereby the' nut is madeand` does not interfere with the ready placing of the nut upon the boltor with the engagement of the nut by a suitable wrench. After the nut Bhas been placed upon the bolt A and secured firmly to desired position,the jaw b will be bent downward until it engages the terminal a2 of thebolt. This downward bending of the jaw b may be eifected so that thisjaw may engage either face of the bolt-terminal, as seen in Fig. 2, orthe jaw may be forced to engage two faces of the bolt-terminal, as seen5 5 in Fig. 3. In either event, when the jaw is thus forced downward itwill effectively serve to guard the nut against relation and thusprevent all possibility of its working loose upon the bolt. Theworkman,having set the nut to the desired point upon the bolt, can, withhis wrench, and without the necessity of employing a supplemental tool,tap the jaw b and so force it against the non-circular terminal ofthebolt and lock the nut in such position. If desired, a jaw b may beformed along two or more sides of the nut without departing fromthe'spirit of the invention.

I am well aware that it has been heretofore proposed to provide anut-lock by cutting a longitudinal groove in the threaded end of thebolt and by forming the nut with a liange that may be forced into suchgroove; but such prior construction is objectionable, for the followingreasons, among others: First, the cutting of the groove across theboltthreads mars the threads, so that it interferes with the easy andaccurate movement of the nut upon the bolt, and particularly is this thecase if the groove happens to cross the So outer end of the thread, orif the groove be made of sufficient width to receive enough of thefiange to afford a substantial looking of the nut in place; second, insuch prior type of nut-lock it is necessary to employ a separate tool toforce the flange into the groove, and as a consequence the workman isapt to overlook the looking of the nut; third, with such priorconstruction there is also danger of the threaded portion of the nutadjacent the groove being crushed or injured by the tool that drives thefiange into the groove; fourth, if the light be poor, or' if the nut bein a somewhat-inaccessible position, as is frequently the case in workupon bridges, 9 5 beneath cars, and in like situations, the workrnan isnot apt to accurately force the fiange into the groove of the bolt, evenif he attempt to do so at all. i

By my invention all of the above-mentioned roo difticulties are entirelyovercome.

I-Iaving thus described the invention, what cent laterai face of thebolt terminal and thereby interlook thel'ewith, substantially asdesoribed.

EDVARDV A. HILL. VVitnesses:

GEO. P. FISHER, J r., ALBERTA ADAMIOK.

